如何在android中按时间执行操作？

Handler handler = new Handler();
Runnable runnable = new Runnable() {
    @Override
    public void run() {
        // 执行操作
    }
};
handler.postDelayed(runnable, delayMillis); // 延迟delayMillis毫秒后执行操作

Timer timer = new Timer();
TimerTask timerTask = new TimerTask() {
    @Override
    public void run() {
        // 执行操作
    }
};
timer.schedule(timerTask, delayMillis); // 延迟delayMillis毫秒后执行操作

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, YourReceiver.class); // YourReceiver为自定义的广播接收器
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
long triggerTime = System.currentTimeMillis() + delayMillis; // 触发时间为当前时间加上延迟时间
alarmManager.set(AlarmManager.RTC_WAKEUP, triggerTime, pendingIntent); // 设置定时任务